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/**
 * Copyright 2017-2018 The OpenTracing Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package io.opentracing.contrib.spring.cloud.websocket;

import io.opentracing.Tracer;
import io.opentracing.propagation.Format;
import io.opentracing.propagation.TextMap;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import org.springframework.messaging.MessageHeaders;

/**
 * A TextMap carrier for use with Tracer.extract() to extract tracing context from Spring messaging
 * {@link MessageHeaders}.
 *
 * @see Tracer#extract(Format, Object)
 */
public final class TextMapExtractAdapter implements TextMap {

  private final Map headers = new HashMap<>();

  public TextMapExtractAdapter(final MessageHeaders headers) {
    for (Map.Entry entry : headers.entrySet()) {
      this.headers.put(entry.getKey(), entry.getValue().toString());
    }
  }

  @Override
  public Iterator> iterator() {
    return headers.entrySet().iterator();
  }

  @Override
  public void put(String key, String value) {
    throw new UnsupportedOperationException(
        "TextMapInjectAdapter should only be used with Tracer.extract()");
  }
}